To find the unit rate price per ounce for the root beer, you can divide the total price by the total number of ounces.
The formula is:
\[ \text{Unit Price} = \frac{\text{Total Price}}{\text{Total Ounces}} \]
Here, the total price is $3.20 and the total ounces is 64 oz.
\[ \text{Unit Price} = \frac{3.20}{64} \]
Now, perform the division:
\[ \text{Unit Price} = 0.05 \]
This means the unit rate price per ounce of root beer is $0.05 per ounce.